What are the reserved IP addresses?

There are a number of reserved IPs for various reasons (note: * is used as the wildcard in the IP address and stand fo any number between 0 and 255):

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There are one set of reserved addresses for 'private' networks for each IP address class:

Class A: 10.*.*.*
Class B: 172.16.*.* - 172.31.*.*
Class C: 192.168.*.*

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The loopback/localhost address:

127.0.0.1 - although the whole rnage is reserved: 127.*.*.*

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The zero addresses can also not be used:

0.*.*.*

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Microsoft APIPA (Automatic Private Internet Protocol Addressing) also reserves a set of IPs:

169.254.*.*

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Emperor

(Added by: Emperor on Fri 02-Apr-2004)